/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.functor.impl.func;

import java.util.Iterator;
import java.util.Map.Entry;

import any.ImmutableAny;
import any.functor.interfaces.Function;
import any.impl.util.MapEntry;
import any.impl.util.Utils;
import any.incubator.IterableConfig;
import any.incubator.IterableConfigCreator;

/**
 * 
 *
 * @param <IM>
 * @param <TO>
 * @param <DS>
 * @param <T>
 */
//TODO: Stupidest name ever!!
public abstract class BaseAnyIteratingAnyCreatingFunction<IM, TO, DS, T extends BaseAnyIteratingAnyCreatingFunction<IM, TO, DS, T>> 
	extends BaseAnyFunction<TO, DS, T>  {

	protected Function<ImmutableAny, IM> asFunc;

	protected BaseAnyIteratingAnyCreatingFunction() {
	}
	
	protected BaseAnyIteratingAnyCreatingFunction(Function<ImmutableAny, IM> asFunc, String description) {
		super(description);
		this.asFunc = asFunc;
	}
	
	public BaseAnyIteratingAnyCreatingFunction(Class<TO> type) {
		super(type);
	}

	public BaseAnyIteratingAnyCreatingFunction(Class<TO> type, String description) {
		super(type, description);
	}

	@SuppressWarnings("unchecked")
	protected Iterable<Entry<String, IM>> entries(ImmutableAny from) {
		IterableConfig config = getIterableConfig();
		final Iterable<? extends Entry<String, ? extends ImmutableAny>> entries = from.entries(config);
		
		if (asFunc == null) {
			return (Iterable)entries;
		} else {
			return Utils.wrapIterator(new Iterator<Entry<String, IM>>() {
				final Iterator<? extends Entry<String, ? extends ImmutableAny>> it = entries.iterator();
				public boolean hasNext() {
					return it.hasNext();
				}
				public Entry<String, IM> next() {
					Entry<String, ? extends ImmutableAny> entry = it.next();
					return MapEntry.createMapEntry(entry.getKey(), entry.getValue().give(asFunc));
				}
				public void remove() {
					it.remove();
				}
			});
		}
	}

	@SuppressWarnings("unchecked")
	protected Iterable<IM> iterable(ImmutableAny from) {
		IterableConfig config = getIterableConfig();
		final Iterable<? extends ImmutableAny> iterable = from.iterable(config);
		
		if (asFunc == null) {
			return (Iterable<IM>)iterable;
		} else {
			return new Iterable<IM>() {
				public Iterator<IM> iterator() {
					final Iterator<? extends ImmutableAny> it = iterable.iterator();
					return new Iterator<IM>() {
						public boolean hasNext() {
							return it.hasNext();
						}
						public IM next() {
							return it.next().give(asFunc);
						}
						public void remove() {
							it.remove();
						}
					};
				}
			};			
		}
	}
	
	@Override
	public String toString() {
		String result = toStringPrefix(); 

		result += " with " + getIterableConfig().toString();
		if (asFunc != null) {
			result += ", each " + asFunc + "; ";
		}
		
		return result;
	}

	protected String toStringPrefix() {
		return description;
	}

	protected IterableConfig getIterableConfig() {
	    return IterableConfigCreator.select(predicate).order(direction);
    }
}
